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Cause Analysis of Rolling Bearing Damage Caused by Overheating
Jan 07, 2019

Damage of rolling bearings caused by overheating: serious discoloration of bearing parts*. The plastic deformation of raceway/rolling body is serious. Temperature changes dramatically. FAG bearings adhere to each other several times, as shown in Figure 77. Hardness is less than 58HRC. Cause: Usually no failure bearing due to overheating is detected. Possible reasons: too small working clearance of bearings, especially at high speed bearing - insufficient lubrication - Radial preload due to external heat source - excessive lubricant - operation obstruction due to cage fracture.

Remedial measures: - Increase bearing clearance - If there is an external heat source, ensure slow heating and cooling, that is to say, make the whole bearing uniformly heated - avoid lubricant accumulation - Improve lubrication 47 pairs of removed bearings to evaluate operating characteristics and damage rolling contact mode 77: Overheated cylindrical roller bearings on the raceway roller left a deep adhesive indentation. Description of discoloration: When bearing shows tempering color, it is related to overheating. The appearance of brown and blue is related to the temperature and the duration of overheating. This phenomenon is very similar to the colouring of lubricating oil due to its high temperature (see Section 3.3.1.1). Therefore, we can not judge whether the operating temperature is too high only from the discoloration item. From the discoloration area, it can be judged whether the discoloration is caused by tempering or grease: the latter usually occurs only in the bearing area of rolling element and ring, and the former usually covers a large area of the bearing surface. However, the only way to identify the existence of high temperature operation is hardness testing.